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Equity (Warrants) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 27, 2014
increments
Dec. 28, 2013
Class of Warrant or Right [Line Items]    
Warrants 59.63crl_Warrents  
Warrants and Rights Outstanding   $ 1,271us-gaap_WarrantsAndRightsOutstanding
Stockholders' Equity Attributable to Noncontrolling Interest 3,724us-gaap_MinorityInterest $ 3,093us-gaap_MinorityInterest
Warrants [Member]    
Class of Warrant or Right [Line Items]    
Warrants issued (in shares) 7,200,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
 
Number of equal increments over which the warrants will expire between September 13, 2013 and January 22, 2014 90crl_ClassOfWarrantOrRightExpirationPeriodNumberOfEqualIncrements
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember